org.apache.tez.analyzer.CSVResult.java Source code

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Here is the source code for org.apache.tez.analyzer.CSVResult.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.tez.analyzer;

import com.google.common.base.Joiner;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.collect.Iterators;
import com.google.common.collect.Lists;
import org.apache.tez.dag.api.TezException;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

/**
 * Simple placeholder for storing CSV results.
 * Contains headers and records in string format.
 */
public class CSVResult implements Result {

    private final String[] headers;
    private final List<String[]> recordsList;
    private String comments;

    public CSVResult(String[] header) {
        this.headers = header;
        recordsList = Lists.newLinkedList();
    }

    public String[] getHeaders() {
        return headers;
    }

    public void addRecord(String[] record) {
        Preconditions.checkArgument(record != null, "Record can't be null");
        Preconditions.checkArgument(record.length == headers.length,
                "Record length" + record.length + " does not match headers length " + headers.length);
        recordsList.add(record);
    }

    public Iterator<String[]> getRecordsIterator() {
        return Iterators.unmodifiableIterator(recordsList.iterator());
    }

    public void setComments(String comments) {
        this.comments = comments;
    }

    @Override
    public String toJson() throws TezException {
        return "";
    }

    @Override
    public String getComments() {
        return comments;
    }

    @Override
    public String toString() {
        return "CSVResult{" + "headers=" + Arrays.toString(headers) + ", recordsList=" + recordsList + '}';
    }

    //For testing
    public void dumpToFile(String fileName) throws IOException {
        OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(new File(fileName)),
                Charset.forName("UTF-8").newEncoder());
        BufferedWriter bw = new BufferedWriter(writer);
        bw.write(Joiner.on(",").join(headers));
        bw.newLine();
        for (String[] record : recordsList) {

            if (record.length != headers.length) {
                continue; //LOG error msg?
            }

            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < record.length; i++) {
                sb.append(!Strings.isNullOrEmpty(record[i]) ? record[i] : " ");
                if (i < record.length - 1) {
                    sb.append(",");
                }
            }
            bw.write(sb.toString());
            bw.newLine();
        }
        bw.flush();
        bw.close();
    }
}